import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;
@WebServlet("/index")
public class LoginServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        HttpSession session = req.getSession(false);
        if(session == null){
            System.out.println("用户未登录！");
            resp.sendRedirect("Login.html");
            return;
        }
        String userName = (String) session.getAttribute("userName");
        resp.setContentType("text/html;charset=utf8");
        resp.getWriter().write("欢迎" + userName + "登录!");
    }
}
